I have some back changes to post.
On my old 2013 Nissan Altima 3.5S w/ X-Tronic CVT, I did two 3qt drain-and-refills using Valvoline Synthetic CVT Fluid (Blue Bottle) and two drain-and-refills with Amsoil CVT Fluid. The factory NS-3 (NS-III) fluid was burnt, cloudy, and had many particulates in it at 24k miles. The Amsoil fluid changes were made at 27k and 29k miles.
The transmission demonstrated the "death shudder" once at steady state cruise at approx 55 mph at about 23k miles. It literally shook the car so violently it felt like we traversed about 10 car-length-spaced cement parking barriers at that speed. The dealer said this was "normal" and their stupid scan-tool said the trnas fluid was also "just fine". The Valvoline fluid changes smoothed things out some but the tranny was still changing ratios slowly. The Amsoil fluid ran and functioned better than the stock fluid did at 13k miles (when I bought the car). Vehicle was sold at 34k miles and the tranny had functioned perfectly since the Amsoil CVT D&R's.
Next, 1999 Subaru Impreza Outback Sport acquired at 112k miles. Did a D&R with 4.5qts of Redline D4 ATF, and then 4.5qts of Mobil-1 Syn ATF (car calls for Dex-III). Both worked significantly smoother than what was in the car when I got it. Also replaced trans filter with a Fram Ultra 7317 (Additional OEM factory trans filter also acquired). The Trans filter is very different from a normal oil filter, but the Fram Ultra has such excellent flow characteristics, it is working just fine for the short interval in which I'm employing it. I want to fully filter the trans fluid for about 10k miles to remove some of the gunk in the system. 3k miles in and so far, so good.
I did the filter change separately from the last D&R with Mobil-1 and lost about 2 quarts of fluid in the process (best guess). I refilled with Valvoline Maxlife Dex/Merc and there was no change in function (still shifting fine).
Lastly, I have a 2011 Subaru Outback 3.6R Limited with the 5EAT 5-speed auto. I did a D&R using
Amsoil Signature Series Multi-Vehicle ATF (meeting the Subaru ATF-HP standard). 4 quarts out and 4 quarts back-in. Tranny was shifting perfectly before (91k miles) and previous fluid was still bright red and clear. No change (still perfect shifting) and some added peace of mind for the colder mornings as Subaru ATF-HP (made by Idemitsu, I think) can be very finicky even on 50 degree mornings, resulting in delayed, harsh shifts. On the last 45 degree morning (cool for Florida), the fluid with Amsoil added shifted noticeably faster and smoother.
